Valve and valve-stem construction for self-grinding valves



' L. D. COLLAR VALVE AND VALVE STEM CONSTRUCTION FOR SELF GRINDING VALVES Filed July 18. 1928 ATTORNEYS.

IN V? TOR.-

Patented Nov. 19, 1929 UNITED STATES PATENT" OFFICE LLOYD n. coLLAE, F BERKELEY, cALrEoRNiA, ASSIGNOR 'ro coLLAE' vALvE' con- PORA'IION, 0F BERKELEY, CALIFORNIA, A CORPORATION OF cALIEoEnIA VALVE AND VAI4VESTEM CONSTRUCTION FOR SELF-GRTNDING VALVES Application filed July 18 This invention relates to valves of the socalled self-grinding type and particularly pertains to certain lmprovements on the valve disclosed in Letters Patent of the United States N 0. 1,544,219 issued to me June 30, 1925. i

The type of valve disclosed in this prior patent includes a valve body having the usual inlet and outlet openings and a valve opening surrounded by a valve seat controlling the flow between the inlet and outlet openings. The valve opening is controlled by a valve which cooperates with the seat. This valve 'is fitted with a stem which is threaded sition the stem threads through the stem block and the latter remains stationary but when the valve abuts against the seat continued rotation of the valve stem causes axial movement of the stem block against the action of the spring, causing the valve to grind on the seat. Also, when commencing to open the valve, the stem of the latter is revolved V sufficiently to move the stem block and relieve the spring before the valve commences to leave the seat. This,ot course, causes agrinding action between the valve and seat prior to opening the valve. I

It is the principal object of the present 1nvention to provide an improved valve and valve stem construction which may be manufactured less expensively than hitherto and which will operate with greater efiiciency than prior structures.

In carrying out this object'into practice I' i have formed the valve stem and the'valve of is exemplified in the following description and illustrated by way ofexample inthe accompanying drawings, in which:

"of'the stem'will cause the stem block 19'toinwardly through the 1928. Serial No. 293,572.

Fig. 1 is a central vertical section through the valve.

Fig. 2 is a View in elevationand section of the valve stem and valve member constructed in accordance with my present invention.

Referring more particularly tothe accompanying drawings, 10 indicates a valve body having the usual inlet and outlet openings 11 and 12, the flow between which is controlled by a val veopeningl h This valve opening 14. is formed with a valve seat 15 controlled by a valve member '16. This valve member 16 is fitted with a stem 17 having'a threaded portion 18 threaded through a stem block 19. This stem block 19 is reciprocably but non-rotatably mounted in a bonnet 20 secured to the valve body 10. A spring 21 is provided and is interposed between the valve body and the stem block'so that the latter may reciprocate against the action of the spring.

As the valve stem is rotated the first action is for the valve stem to move upwardly through the stem block seating the valve. When the valve is seated continued rotation moveudownwardly against the action of the spring 21 causing the valve to grind on its seat. l V

In opening the valve rotation of the stem will first cause the stem block 19 to move outwardly to its outermost position abutting against the bonnet. Continued rotation of the stem then causesthe valve stem to thread stem block and open the valve- The construction of the stem block, bonnet and the spring is fully described and claimed in my copending applications entitled Valve, filed J uly 18, 1928, Ser. No. 293,570, andBonnet construction for self-grinding valves; filed July 18, 1928, Ser. No. 293,571;'

The principal feature of the present. invention is the construction of the valve stem and valve which permits them to be manufactured rapidly and inexpensively so that the valve itself may be produced at a mini- 3 'mum of cost.

The outer-end of the valve stem is threadedto receive the hand wheel. Atits other end the valve stem is formed with an annularly. i

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projecting collar 22. Beyond this collar the valve stem is threaded as at 23. The valve disk 16 istapped and is threaded onto the threaded end 23 of the valve stem against the shoulder or collar 22. A nut 24 is then threaded on the end 23 to clamp and lock the disk 16 in place: V t

It is obvious that by this construction both I the valve stemand the valve 16 may be'produced very inexpensively and very rapidly This, of 3 on automatic screw machines.

7 course,v reduces their production cost to a minimum and enables stock materials to be used in their production.

While I have shown the preferred form of my invention, it is to be understood that various changes may be made in its construction by those skilled'in the art Without departing from the spiritof the invention as def ned in the appended claim.

Having thus described my inventiony what I elaim and desire to secure by Letters Patent V l I v-alve stem assembly for a valve of the character described comprising avalve stem 7 hav ng an intermediate threaded portion of a @diameter slightly larger than the remainder of the stem, an annular collar formed on said valve stem of a diameter substantally the same as said threads, the extremity of the I valve-stem beyond said collar being threaded,

. avalve disk threaded on to saidthreaded end against said collar; and clamping means clamping saidjdisk in position; s

' LLOYD D. ;GOLLA'R.

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